Hi Gvkauffman,
I’m assuming that by “box spring” you mean a base that actually flexes and has some type of springs in it rather than a foundation which has no flex at all?
Either way though, assuming it is suitable for the mattress, if it is still in “new” condition with no weak, or softer areas or sags, and still has a firm even surface like when it was new it would be OK. Post #2 here may also help.
Phoenix